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Journal of Plant Research

, Volume 109, Issue 2, pp 177–184 | Cite as

Dependence of the aboveground CO2 exchange rate on tree size in field-grown hinoki cypress (Chamaecyparis obtusa)

  • Taketo Yokota
  • Akio Hagihara
Original Articles

Abstract

The CO2 exchange of the aboveground parts for five different-sized 17-year-old (as of 1991) hinoki cypress (Chamaecyparis obtusa) trees growing in the field was non-destructively measured over one year, using an open CO2 exchange system. The CO2 exchange of individual trees decreased with decreasing tree sizes, such as aboveground phytomass, leaf mass and leaf area. However, the CO2 exchange abruptly decreased near the smallest-suppressed sample tree. The size dependence was well described by a generalized power function. The annual gross photosynthesis of individual trees was proportional to the square root of leaf mass or leaf area. The dependence of CO2 exchange on annual phytomass increment was described by a simple power function with an exponent value less than unity, suggesting that CO2 exchange per unit of phytomass increment was lower in larger-sized trees than in smaller-sized trees. The mean photosynthetic activity of a tree, i.e., gross photosynthesis per unit of leaf area, slightly increased to its highest value with decreasing leaf area and then decreased abruptly near the smallest sample tree. The maximum value of mean photosynthetic activity was estimated to be 2.85 kg CO2 m−2 year−1 for a leaf area of 1.56 m2 tree−1. The ratio of mean photosynthetic activity to the maximum photosynthetic activity was the highest in an intermediate tree and decreased gradually toward larger-sized trees by ca. 60% and also decreased toward the smallest suppressed tree by ca. 35%.

Key words

Chamaecyparis obtusa Gross photosynthesis Individual trees Photosynthetic activity Respiration Tree size dependence 

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Copyright information

© The Botanical Society of Japan 1996

Authors and Affiliations

  • Taketo Yokota
    • 1
  • Akio Hagihara
    • 1
  1. 1.Laboratory of Forest Ecophysiology, School of Agricultural SciencesNagoya UniversityNagoyaJapan

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